Uksubs; the F-80 Shooting Star was for all practical purposes a prototype in that it never saw combat in WWII and was of limited production. The F-80 did see combat in Korea, but by then was obsolete and was replaced by the F-86; which was based on German swept wing research and was very similar to those paper project jets you cited, as was the Russian MIG-15. The de Havilland Vampire was very similar to the Focke Wulf Flitzer; a paper design by Kurt Tank. The Flitzer design was somewhat more advanced however, as it had swept wings! Early jets are very interesting.